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M - 2(M - 1) = 4
M - 2M + 2 = 4
- M + 2 = 4
2 - 4 = M
- 2 = M
Respuesta.
M = - 2
m- 2m + 2 = 4
-m = 4 - 2
(-1) -m = 2 (-1)
m = -2